Opti-LubeSummer+ Cetane Formula Diesel Fuel Additive: 1 Gallon with Accessories (HDPE Plastic Hand Pump and 2 Empty 4oz Bottles) Treats up to 2,560 Gallons

Bought the opti with cetane booster, use it for three weeks, this is a pic of my fuel water separator used in my 2017 Kenworth T-680, with a Cummins ISX rated at 475 horsepower, 462,500 on the motor, after 11,000 miles of use on this filter, which I changed today 6-12-25, the pic is worth a thousand words, normally, with the amount of soot buildup in these DPF trucks, this filter would be dark black as U can see it isn't, very surprised at this result, called the manufacturer about how often to use, they said every fillup, I started using it every other fill, it seems to work well, been driving for 15yrs never seen a product do this, used a lot of products, trial and error, for the money it does it's job!

Improve my mileage on our trip to Missouri in my 1998 Dodge ram 2500 4x4 with a Cummins 5.9 with 4.10 gears. 24 miles to a gallon of diesel fuel.

Love this product. I have been using for 3 summers in my Mack triable dump truck. Truck seems to run smoother and get slightly better MPG when I use it. I dropped the stars from 5 to 4 because of the size of the small containers that come in the kit. I have been using the same small bottles to refill and carry with me for a couple years. I decided to buy the kit with the pump and bottles again this time to replace what I have because they are getting old and dirty. If I use these new ones I can only carry half the additive with me as before. I may have to just find a different container myself but if I had known this I wouldn’t have paid extra for the kit.

I had an external water separator fail on my lift pump and the truck was dumping fuel even at idle. The CP4 Bosch fuel pump installed on my GMC is known for failure and Optilube saved me thousands in repairs. Getting on the highway and anytime I went past 1/4 throttle the truck would starve for fuel and fall on it's face. Optilube kept the pump from destroying itself while I gingerly drove it the rest of the way home. It's been 3,000 miles since the incident and the truck is running strong. I will be a customer for life!

This is one of the top rated additives on the market and gives me piece of mind when using my truck

You can buy this bottle for the same price on Amazon as from Optilube itself. I chose to buy through Amazon because I had a bonus with Amex for double points for Amazon purchases. As far as the product does it's great. I use it for every fill-up with my 2016 GMC Sierra 3500 Duramax. Works great seem to quiet down the injectors and I pull 10,000 pound trailers almost continuously. Love the product.

At the suggestion of another diesel user we put Opti-Lube since our first fill-up. Pleasure Way Plateau xlmb B+ with a non-turbo diesel. Not overly loaded and we usually hold 5 miles under the speed limit. We have been averaging over 15mph with a high of almost 19mph. I continue to read on additives and I don't plan to stop using this one.

We used the winter opti-lube last winter and it made for easy starting on our diesel trucks and better fuel economy. It was recommended by a diesel mechanic friend. We got the opti-lube for summer formula and it also increases fuel economy. Diesel these days is not as good as it used to be - just like most things. This is what you need for your diesel motors to keep them going strong.